[pre-commit.ci] auto fixes from pre-commit.com hooks

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examples/heatmap_human_brain.py

@@ -4,6 +4,7 @@
 
 N.B. the physical scales are very different to e.g. the small animal atlases.
 """
+
 import brainglobe_heatmap as bgh
 
 values = dict(  # scalar values for each region